Health Sciences 3300A/B Lecture Notes - Lecture 9: Pharynx, Epiglottis, Trachea

• School: Western University
• Department: Health Sciences
• Course: Health Sciences 3300A/B
• Professor: Oleksiy Zaika

Document Summary

Lecture 11 the respiratory system part 2 lower respiratory. Voice box , connects laryngopharynx to trachea: allows air to enter trachea, but keeps food out, composed of 9 pieces of cartilage. Paired: arytenoid (important for manipulating vocal cords, cuneiform, corniculate. These are the false vocal cords: where air passes through, vibrates as we speak, emergency airway, cricothyrotomy (crike) Voice production: changes to vocal folds produce changes in sounds. Intrinsic muscles: act on vocal cords only, abduction and adduction. Extrinsic muscles: act on entire laryngeal skeleton, elevate and depress larynx. Posterior cricoarytenoid muscles: abduct vocal cords (open, more louder. This is the only muscle that opens vocal cords. If something happens to these muscles or its innervation, we will have trouble opening airway. Superior thyroid artery: gives off superior laryngeal a, hole in the thyrohyoid membrane is where superior laryngeal a. can go through. Inferior laryngeal artery: comes off of thyrocervical trunk.